非质子溶剂中丙烯环氧化反应  

Propylene epoxidation in nonprotic solvent

作　　者：孟纪文[1] 李钢[1] 王祥生[1] 郭新闻[1] 

机构地区：[1]大连理工大学催化化学与工程系,辽宁大连116012

出　　处：《大连理工大学学报》2003年第5期577-581,共5页Journal of Dalian University of Technology

基　　金：国家重点基础研究发展规划资助项目(G2000048009);辽宁省博士起动基金资助项目(2001102085).

摘　　要：研究了非质子溶剂中钛硅分子筛催化的丙烯环氧化反应.结果表明,随着非质子溶剂极性的增大,反应活性增加.在以丙酮为溶剂的丙烯环氧化反应中,随着反应介质pH降低,反应活性和过氧化氢有效利用率基本不变;pH升高,反应活性和过氧化氢有效利用率均降低.温度对反应活性影响显著,温度升高,双氧水转化率增加,并且保持很高的环氧丙烷选择性,但双氧水有效利用率降低.甲醇-丙酮混合溶剂中丙酮体积分数低于50%时,丙烯环氧化反应活性比纯甲醇为溶剂时降低不大,而环氧丙烷选择性大大提高.Propylene epoxidation in nonprotic solvent catalyzed by TS-1 was studied. The results show that the activity increases with the increase of polarity of nonprotic solvent. When acetone is used as solvent, the decrease of pH of the medium nearly has no effect on the activity and the hydrogen peroxide utilization; but when the pH increases, both of them decrease. The temperature has a great effect on the activity. Hydrogen peroxide conversion increases with the increase of temperature, and the reaction retains a high propylene oxide selectivity, but the hydrogen peroxide utilization decreases dramatically. When the volume fraction of acetone in the co-solvent of methanol and acetone is no more than 50%, the activity is lower slightly than that of the reaction with methanol as solvent, but the selectivity of propylene oxide increases greatly.

关 键 词：丙烯 环氧化反应 非质子溶剂 环氧丙烷 钛硅分子筛催化剂 过氧化氢 氧化剂 

分 类 号：O624.11[理学—有机化学] O621.254.1[理学—化学]